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Proposal:

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If an ETag is returned when requesting the metadata document, then the service SHOULD set the odata.metadataEtag annotation to the metadata document's ETag in all responses when using odata.metadata=minimal or full. If no ETag is returned when requesting the metadata document, then the service SHOULD NOT set the odata.metadataEtag annotation in any responses.

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If an ETag is returned when requesting the metadata document, then the service SHOULD set the odata.metadataEtag annotation to the metadata document's ETag in all responses when using odata.metadata=minimal or full. If no ETag is returned when requesting the metadata document, then the service SHOULD NOT set the odata.metadataEtag annotation in any responses.
Resolution:

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https://www.oasis-open.org/committees/download.php/54711/odata-json-format-v4.0-wd08-2014-12-12.docx

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https://www.oasis-open.org/committees/download.php/54711/odata-json-format-v4.0-wd08-2014-12-12.docx

In the JSON format doc, section 4.5.2, there is this partial statement about odata.metadataEtag:

"The odata.metadataEtag annotation MAY appear in a response in order to specify..."

The "MAY" in this statement needs to be clarified so it is clear when the metadata ETag will be returned.